diagram INFINITI QX56 2008 Factory Service Manual

MWI
METER SYSTEMMWI-17
< FUNCTION DIAGNOSIS >
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O PODO/TRIP METER : Component DescriptionINFOID:0000000001691269
SHIFT POSITION INDICATOR
SHIFT POSITION INDICATOR : System DiagramINFOID:0000000001691270
SHIFT POSITION INDICATOR : System DescriptionINFOID:0000000001691271
The TCM receives A/T indicator signals from the tr ansmission range switch. The TCM then sends A/T position
indicator signals to the combination meter via CAN co mmunication lines. The combination meter indicates the
received shift position.
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
Unit Description
Combination meter Converts the vehicle speed signal
received from the ABS actuator and electric unit (control unit) via
CAN communication to mileage, and it displays the accumulated mileage to the odo/trip meter.
ABS actuator and electric unit
(control unit) Transmits the vehicle speed signal to the combination meter via CAN communication.
AWNIA1906GB
Revision: March 2010
2008 QX56

MWI-18
< FUNCTION DIAGNOSIS >
METER SYSTEM
SHIFT POSITION INDICATOR : Component Parts Location
INFOID:0000000001696375
SHIFT POSITION INDICATOR : Component DescriptionINFOID:0000000001691273
WARNING LAMPS/INDICATOR LAMPS
WARNING LAMPS/INDICATOR LAMPS : System DiagramINFOID:0000000001691274
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control
unit) E125 6. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Displays the shift position on the information display using shift position signal received from TCM.
TCM Transmits the shift position signal to the combination meter via CAN communication.
JSNIA0449GB
Revision: March 2010 2008 QX56

MWI-20
< FUNCTION DIAGNOSIS >
METER SYSTEM
INFORMATION DISPLAY : System Diagram
INFOID:0000000001691278
INFORMATION DISPLAY : System DescriptionINFOID:0000000001691279
FUNCTION
The information display can indicate the following items.
• Intelligent Key operation information
• Maintenance information
• Warning/Indication messages (Door/liftgate/liftgate glass open, low fuel, low washer fluid, parking brake, A/T
oil temp)
DOOR OPEN WARNING
This warning appears when the ignition switch is ON and the front door LH, front door RH, rear door LH, rear
door RH, back door or glass hatch is opened. The BCM receives a door switch signal from the front door
switch LH, front door switch RH, rear door switch LH, rear door switch RH, back door latch and glass hatch
ajar switch. The BCM sends the door switch signal to the combination meter via CAN communication lines.
Then, when the ignition switch is turned ON, the warning message is displayed.
LOW FUEL WARNING
This warning appears when the fuel level in the fuel tank is less than approximately 11.4 (3 US gal, 2.5 Imp
gal). A variable resistor signal is supplied to the combination meter from the fuel level sensor unit to determine
the amount of fuel in the fuel tank.
LOW WINDSHIELD WASHER FLUID WARNING
This warning appears when the windshield washer fluid level is low. When the windshield washer fluid level is
low, the washer level switch provides a ground signal to the combination meter (unified meter control unit).
Once fluid is added, the message will stay on for 30 seconds and then turn off.
PARKING BRAKE INDICATOR
When the parking brake is applied, the parking brake switch provides a ground signal to the combination
meter (unified meter control unit). Then, when the igni tion switch is turned ON and vehicle speed is greater
than 7 km/h (4 MPH), the message is displayed.
Refer to Owner’s Manual for additional information display items.
AWNIA0202GB
Revision: March 2010 2008 QX56

MWI-38
< COMPONENT DIAGNOSIS >
COMPASS
COMPASS
Wiring DiagramINFOID:0000000001691308
ALNWA0133GB
Revision: March 20102008 QX56

MWI-40
< COMPONENT DIAGNOSIS >
CLOCK
CLOCK
Wiring DiagramINFOID:0000000001696401
ALNWA0134GB
Revision: March 20102008 QX56

MWI-44
< ECU DIAGNOSIS >
COMBINATION METER
Wiring Diagram
INFOID:0000000001691310
ABNWA0807GB
Revision: March 2010 2008 QX56

MWI-64
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE)
Reference ValueINFOID:0000000001696513
Refer to BCS-38, "Reference Value".
Terminal LayoutINFOID:0000000001696514
Refer to BCS-40, "Terminal Layout".
Physical ValuesINFOID:0000000001696515
Refer to BCS-40, "Physical Values".
Wiring DiagramINFOID:0000000001696516
Refer to BCS-46, "Wiring Diagram".
DTC Inspection Priority ChartINFOID:0000000001696517
Refer to BCS-50, "DTCInspectionPriorityChart".
DTC IndexINFOID:0000000001696518
Refer to BCS-50, "DTCIndex".
Revision: March 2010 2008 QX56

MWI
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
MWI-65
< ECU DIAGNOSIS >
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)
Reference ValueINFOID:0000000001696519
Refer to PCS-19, "Reference Value".
Terminal LayoutINFOID:0000000001696520
Refer to PCS-21, "Terminal Layout".
Physical ValuesINFOID:0000000001696521
Refer to PCS-21, "Physical Values".
Wiring DiagramINFOID:0000000001696522
Refer to PCS-26, "Wiring Diagram".
Fail SafeINFOID:0000000001696523
Refer to PCS-29, "FailSafe".
DTC IndexINFOID:0000000001696524
Refer to PCS-31, "DTCIndex".
Revision: March 2010 2008 QX56

PCS
PCS-1
ELECTRICAL & POWER CONTROL
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SECTION PCS
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CONTENTS
POWER CONTROL SYSTEM
IPDM E/R
BASIC INSPECTION ....... .............................
2
DIAGNOSIS AND REPAIR WORKFLOW ..... .....2
Work Flow ........................................................... ......2
FUNCTION DIAGNOSIS ...............................5
RELAY CONTROL SYSTEM ......................... .....5
System Diagram .................................................. ......5
System Description ...................................................6
Component Parts Location ........................................7
POWER CONTROL SYSTEM .............................8
System Diagram .................................................. ......8
System Description ...................................................8
SIGNAL BUFFER SYSTEM ................................9
System Diagram .................................................. ......9
System Description ...................................................9
POWER CONSUMPTION CONTROL SYS-
TEM ....................................................................
10
System Diagram .................................................. ....10
System Description .................................................10
Component Parts Location ......................................11
DIAGNOSIS SYSTEM (IPDM E/R) .....................12
Diagnosis Description ......................................... ....12
CONSULT - III Function (IPDM E/R) .......................14
COMPONENT DIAGNOSIS .........................17
U1000 CAN COMM CIRCUIT ...........................17
Description ........................................................... ....17
DTC Logic ................................................................17
Diagnosis Procedure ...............................................17
POWER SUPPLY AND GROUND CIRCUIT ....18
Diagnosis Procedure ...............................................18
ECU DIAGNOSIS .........................................19
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
19
Reference Value .................................................. ....19
Terminal Layout .......................................................21
Physical Values ................................................... ....21
Wiring Diagram ........................................................26
Fail Safe ..................................................................29
DTC Index ...............................................................31
PRECAUTION ..............................................32
PRECAUTIONS .................................................32
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
32
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ...................................
32
REMOVAL AND INSTALLATION ...............34
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
34
Removal and Installation of IPDM E/R ................ ....34
Revision: March 2010 2008 QX56

PCS
RELAY CONTROL SYSTEMPCS-5
< FUNCTION DIAGNOSIS > [IPDM E/R]
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FUNCTION DIAGNOSIS
RELAY CONTROL SYSTEM
System DiagramINFOID:0000000001696480
AWMIA1109GB
Revision: March 2010
2008 QX56